US4885935A - Engine testing system - Google Patents

Engine testing system Download PDF

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Publication number
US4885935A
US4885935A US07/211,601 US21160188A US4885935A US 4885935 A US4885935 A US 4885935A US 21160188 A US21160188 A US 21160188A US 4885935 A US4885935 A US 4885935A
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US
United States
Prior art keywords
engine
determining
speed
predetermined
throttle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/211,601
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English (en)
Inventor
Roger K. Feller
Samuel R. Warner
Janice D. Capriotti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Visteon Global Technologies Inc
Original Assignee
Ford Motor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ford Motor Co filed Critical Ford Motor Co
Priority to US07/211,601 priority Critical patent/US4885935A/en
Assigned to FORD MOTOR COMPANY, A CORP. OF DE reassignment FORD MOTOR COMPANY, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WARNER, SAMUEL R., CAPRIOTTI, JANICE D., FELLER, ROGER K.
Priority to DE3913782A priority patent/DE3913782A1/de
Priority to GB8910695A priority patent/GB2220085B/en
Priority to US07/419,569 priority patent/US4984454A/en
Application granted granted Critical
Publication of US4885935A publication Critical patent/US4885935A/en
Assigned to VISTEON GLOBAL TECHNOLOGIES, INC. reassignment VISTEON GLOBAL TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FORD MOTOR COMPANY
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00—Testing of engines
    • G01M15/04—Testing internal-combustion engines
    • G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/32—Controlling fuel injection of the low pressure type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P17/00—Testing of ignition installations, e.g. in combination with adjusting; Testing of ignition timing in compression-ignition engines

Definitions

  • This invention relates to an engine testing system.
  • An engine testing system in accordance with an embodiment of this invention has an air charge determination means which generates an indication of engine air charge.
  • the engine testing system further includes a table defining an engine operating parameter as a function of both engine speed and adaptive engine air charge.
  • a table can be a spark table defining engine ignition spark timing as a function of both engine air charge and engine speed or a fuel multiplier table defining a fuel charge adjustment applied to the engine as a function of both normalized throttle angle and engine coolant temperature.
  • air charge is defined by throttle angle.
  • end of line engine testing can be accomplished without the need for mass airflow sensors or manifold absolute pressure sensors.
  • Such engine testing using interactive control of engine operation with adaptive throttle angle and engine speed as primary inputs is available at a relatively low cost.
  • the low cost advantage is obtained, in part, because of the capability for inferring air charge through the measurement of throttle position and avoiding the use of a manifold absolute pressure sensor.
  • the engine testing system does make use of a throttle position sensor, an engine coolant sensor, an idle speed control valve, an ignition system, fuel injectors, a fuel rail and an engine wiring harness.
  • FIG. 1 is a block diagram of an engine testing system in accordance with an embodiment of this invention
  • FIG. 2 is a block diagram of a control module portion of FIG. 1, in accordance with an embodiment of this invention
  • FIG. 3A is a table representing engine air charge with respect to normalized throttle angle and engine speed
  • FIG. 3B is a table representing spark advance with respect to engine air charge and engine speed
  • FIG. 3C is a table representing the magnitude of a fuel adjustment to be supplied with respect to normalized throttle angle and engine coolant temperature
  • FIG. 4 is a logic flow block diagram of the operation of an engine control system in accordance with an embodiment of this invention.
  • FIG. 5 is a logic flow block diagram of a portion of the logic flow block diagram of FIG. 4.
  • a speed throttle engine testing system 10 utilizes throttle angle as a load determination instead of, for example, measured mass air flow or measured manifold vacuum for calculated speed density.
  • the throttle angle is a primary input to the control of spark timing, fuel injection and idle speed.
  • Adaptive strategies are utilized to reduce the need for additional sensors. For example, an adaptive strategy can be based on feedback as a function of minimum throttle position.
  • speed throttle engine testing system 10 includes an electronic engine control (EEC) module 11 coupled to an engine 12.
  • EEC module 11 includes the following signal processing and storage: air charge calculation module 13, self test module 14, idle speed control (ISC) module 15, fuel calculation module 18 and spark advance calculation module 19.
  • ISC idle speed control
  • Fuel calculation module 18 has an output applied to fuel injectors 20 which are coupled to engine 12. If desired, a heated exhaust gas oxygen sensor can be used to provide feedback correction of engine air/fuel ratio.
  • Idle speed control (ISC) module 15 applies a signal to a bypass air solenoid 22 which in turn is coupled to a fuel charging assembly of engine 12.
  • Spark advance calculation module 19 provides an output to a thick film ignition (TFI) module 23 which applies current to ignition coils 24 which in turn are coupled to spark plugs 25 of engine 12.
  • a signal representing engine coolant temperature (ECT) is applied from engine 12 to spark advance calculation module 19, fuel calculation module 18, and idle speed control module 15.
  • a signal representing instantaneous throttle position (TP) is applied to air charge calculation module 13, fuel calculation module 18, and idle speed control module 15.
  • a custom central processing unit (CPU) 30 is coupled by two way communication to a custom electrically programmable read only memory (EPROM) 32.
  • Custom CPU 30 is used to store the base spark table and the base fuel table information.
  • CPU 30 receives signals from interface circuitry 33, and supplies signals to an idle speed control (ISC) bypass air circuit 34, injector drivers 35, and auxiliary drivers 36.
  • ISC idle speed control
  • Drivers 36 have outputs to a fuel pump, a self test output and spark advance information.
  • Interface circuitry 33 receives signals supplying information characterizing engine coolant temperature (ECT), throttle position (TP), self test input switch (STI), and crankshaft position. Since the engine management system in accordance with an embodiment of this invention uses throttle position for engine load indication, the accuracy of the throttle position sensor is relatively more important than the accuracy of the other sensors. Using adaptive correction, the lowest throttle position reading is assumed to be a closed throttle reading. This closed throttle position reading is used as a base for other throttle position readings indicating how much the throttle is open. Idle speed control bypass air circuit 34 provides a duty cycle output to the idle speed control bypass air solenoid. Injector drivers 35 have an output to fuel injectors.
  • Engine test system 10 uses three tables as indicated in FIGS. 3A, 3B and 3C.
  • an engine air charge table is a function of normalized throttle angle and engine speed.
  • the air charge value is used as one axial input for the table in FIG. 3B.
  • the spark table is a function of engine speed on one axis and of engine air charge on the other axis.
  • a fuel adjustment table is a function of engine coolant temperature and normalized throttle angle.
  • FIG. 4 a block diagram illustrates the logic which occurs within (EEC) control module 11 which is coupled to engine 12 during engine testing.
  • Interactive operation of an engine testing control system in accordance with an embodiment of this invention begins at block 41 with START.
  • the logic sequence then goes to a block 42 where an engine warmup is determined by checking to see if the coolant temperature (ECT) is greater than a calibrated value (CV).
  • ECT coolant temperature
  • CV calibrated value
  • the engine control strategy for idle speed is such as to run an engine at sufficiently high speeds to increase engine coolant temperature sufficiently fast for a relatively quick engine test. That is, the high speed idle engine operation is extended compared to normal operation of an engine installed in a car.
  • a further breakdown of initiate self-test block 49 includes blocks 51 through 55, wherein various checks are performed and the results stored for output at block 50.
  • Block 51 determines whether or not ECT is within a predetermined temperature range defined by magnitudes A and B.
  • Block 52 determines whether or not ECT is above some predetermined temperature magnitude C.
  • Block 53 determines whether or not throttle position is within a predetermined angular position range defined by angular positions D and E.
  • Block 54 determines whether engine RPM is greater than predetermined magnitude F.
  • Block 55 determines whether or not the duty cycle of the signal applied to the engine idle speed control valve is above a predetermined value G.
  • engine testing system 10 allows the running of different types of engines with one single relatively low cost engine test system and verifies the integrity and functionality of the engine, engine wiring harness, ECT and TP sensors as well as idle speed control valve operation.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
US07/211,601 1988-06-27 1988-06-27 Engine testing system Expired - Fee Related US4885935A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US07/211,601 US4885935A (en) 1988-06-27 1988-06-27 Engine testing system
DE3913782A DE3913782A1 (de) 1988-06-27 1989-04-26 Motortestsystem
GB8910695A GB2220085B (en) 1988-06-27 1989-05-10 Engine testing system
US07/419,569 US4984454A (en) 1988-06-27 1989-10-10 Engine testing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US07/211,601 US4885935A (en) 1988-06-27 1988-06-27 Engine testing system

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US07/419,569 Division US4984454A (en) 1988-06-27 1989-10-10 Engine testing system

Publications (1)

Publication Number Publication Date
US4885935A true US4885935A (en) 1989-12-12

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ID=22787599

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/211,601 Expired - Fee Related US4885935A (en) 1988-06-27 1988-06-27 Engine testing system

Country Status (3)

Country Link
US (1) US4885935A (fr)
DE (1) DE3913782A1 (fr)
GB (1) GB2220085B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5652380A (en) * 1995-02-24 1997-07-29 Unisia Jecs Corporation Apparatus and method for detecting output fluctuations of an internal combustion engine, and apparatus and method for controlling the engine
US5993917A (en) * 1996-06-19 1999-11-30 Hewlett-Packard Co. Method and apparatus for improving wettability of foam
US6397816B1 (en) * 2000-10-23 2002-06-04 Visteon Global Technologies, Inc. Throttle position control method and system
US7367219B1 (en) 2006-12-28 2008-05-06 Honda Motor Co., Ltd. Automatic control of leak test unit during testing and analysis of an engine
US20080314349A1 (en) * 2007-06-25 2008-12-25 Robert Bosch Gmbh Green start engine control systems and methods
CN106275464A (zh) * 2016-08-26 2017-01-04 杨百川 一种空速自动保护系统

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2241091B (en) * 1990-02-14 1994-01-19 Toshiba Kk Air conditioning apparatus connecting one outdoor unit with several indoor units through several refrigerant tubes and signal conductors
JPH0494432A (ja) * 1990-08-08 1992-03-26 Nissan Motor Co Ltd エンジンの異常検出装置
EP1360477B1 (fr) 2001-01-26 2006-04-05 Rolf Sandvoss Procede thermographique

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191144A (en) * 1977-09-05 1980-03-04 Toyota Jidosha Kogyo Kabushiki Kaisha Method for controlling ignition timing in an internal combustion engine
US4242994A (en) * 1977-12-05 1981-01-06 The Bendix Corporation Idle speed control system for vehicle engines
US4275694A (en) * 1978-09-27 1981-06-30 Nissan Motor Company, Limited Electronic controlled fuel injection system
US4344398A (en) * 1979-05-29 1982-08-17 Nissan Motor Company, Limited Idle speed control method and system for an internal combustion engine of an automotive vehicle
US4502446A (en) * 1981-12-10 1985-03-05 Nissan Motor Company, Limited Fail-safe system for automotive engine control system for fail-safe operation as crank angle sensor fails operation thereof and fail-safe method therefor, and detection of fault in crank angle sensor
US4617898A (en) * 1981-07-07 1986-10-21 Piper Fm Limited Fuel delivery to internal combustion engines
US4664090A (en) * 1985-10-11 1987-05-12 General Motors Corporation Air flow measuring system for internal combustion engines
US4696277A (en) * 1985-11-04 1987-09-29 Nippondenso Co., Ltd. Engine alarm system
US4730484A (en) * 1986-06-20 1988-03-15 Robert Olschefski Missing bearing detector
US4774922A (en) * 1986-10-17 1988-10-04 Nissan Motor Company, Limited Spark ignition timing control system for spark ignition internal combustion engine with quicker advance of spark advance in transition from anti-knock mode to MBI mode control operation
US4776312A (en) * 1984-09-07 1988-10-11 Mazda Motor Corporation Engine roughness control

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2824190A1 (de) * 1978-06-02 1979-12-06 Bosch Gmbh Robert Mikrorechner-system zur steuerung von betriebsvorgaengen in kraftfahrzeugen, mit einer diagnoseeinrichtung zur ueberpruefung des kraftfahrzeuges
US4426982A (en) * 1980-10-08 1984-01-24 Friedmann & Maier Aktiengesellschaft Process for controlling the beginning of delivery of a fuel injection pump and device for performing said process
JPS62233452A (ja) * 1986-03-31 1987-10-13 Mitsubishi Electric Corp ガソリンエンジンの燃料噴射制御装置

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4191144A (en) * 1977-09-05 1980-03-04 Toyota Jidosha Kogyo Kabushiki Kaisha Method for controlling ignition timing in an internal combustion engine
US4242994A (en) * 1977-12-05 1981-01-06 The Bendix Corporation Idle speed control system for vehicle engines
US4275694A (en) * 1978-09-27 1981-06-30 Nissan Motor Company, Limited Electronic controlled fuel injection system
US4344398A (en) * 1979-05-29 1982-08-17 Nissan Motor Company, Limited Idle speed control method and system for an internal combustion engine of an automotive vehicle
US4617898A (en) * 1981-07-07 1986-10-21 Piper Fm Limited Fuel delivery to internal combustion engines
US4502446A (en) * 1981-12-10 1985-03-05 Nissan Motor Company, Limited Fail-safe system for automotive engine control system for fail-safe operation as crank angle sensor fails operation thereof and fail-safe method therefor, and detection of fault in crank angle sensor
US4776312A (en) * 1984-09-07 1988-10-11 Mazda Motor Corporation Engine roughness control
US4664090A (en) * 1985-10-11 1987-05-12 General Motors Corporation Air flow measuring system for internal combustion engines
US4696277A (en) * 1985-11-04 1987-09-29 Nippondenso Co., Ltd. Engine alarm system
US4730484A (en) * 1986-06-20 1988-03-15 Robert Olschefski Missing bearing detector
US4774922A (en) * 1986-10-17 1988-10-04 Nissan Motor Company, Limited Spark ignition timing control system for spark ignition internal combustion engine with quicker advance of spark advance in transition from anti-knock mode to MBI mode control operation

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5652380A (en) * 1995-02-24 1997-07-29 Unisia Jecs Corporation Apparatus and method for detecting output fluctuations of an internal combustion engine, and apparatus and method for controlling the engine
US5993917A (en) * 1996-06-19 1999-11-30 Hewlett-Packard Co. Method and apparatus for improving wettability of foam
US6397816B1 (en) * 2000-10-23 2002-06-04 Visteon Global Technologies, Inc. Throttle position control method and system
US7367219B1 (en) 2006-12-28 2008-05-06 Honda Motor Co., Ltd. Automatic control of leak test unit during testing and analysis of an engine
US20080314349A1 (en) * 2007-06-25 2008-12-25 Robert Bosch Gmbh Green start engine control systems and methods
CN106275464A (zh) * 2016-08-26 2017-01-04 杨百川 一种空速自动保护系统
CN106275464B (zh) * 2016-08-26 2018-08-10 杨百川 一种空速自动保护系统

Also Published As

Publication number Publication date
GB8910695D0 (en) 1989-06-28
GB2220085B (en) 1993-02-03
GB2220085A (en) 1989-12-28
DE3913782A1 (de) 1990-01-04
DE3913782C2 (fr) 1993-04-08

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Owner name: FORD MOTOR COMPANY, DEARBORN, MI A CORP. OF DE

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